7. Выполните действия. a) -1$$\frac{1}{2}$$ : 2.25; б) 3,125 : (-8); в) -2$$\frac{3}{22}$$ ⋅ $$\frac{8}{22}$$;

Ответ: a) -$$\frac{2}{3}$$; б) -0.390625; в) -$$\frac{43}{121}$$

1. a) -1$$\frac{1}{2}$$ : 2.25 = -$$\frac{3}{2}$$ : $$\frac{9}{4}$$ = -$$\frac{3}{2}$$ ⋅ $$\frac{4}{9}$$ = -$$\frac{12}{18}$$ = -$$\frac{2}{3}$$
2. б) 3,125 : (-8) = -0.390625
3. в) -2$$\frac{3}{22}$$ ⋅ $$\frac{8}{22}$$ = -$$\frac{47}{22}$$ ⋅ $$\frac{8}{22}$$ = -$$\frac{376}{484}$$ = -$$\frac{47⋅8}{60⋅8}$$ = -$$\frac{47}{60}$$

Ответ: a) -$$\frac{2}{3}$$; б) -0.390625; в) -$$\frac{43}{121}$$